Enterasys Networks Fast Network 10 - Manual (Page 97)

Using Filters to Enhance Network Performance
Fast Network 10 User Guide Page 5-17
Example 4: Using a Firewall Filter to Control Multicasts
To optimize network performance, you can configure filters to reduce
multicasts (packets broadcast to multiple destinations). In addition, you
can prevent multicasts packets of a particular protocol type.
In this example, four LANs are interconnected by a FN10 (see
Figure 5-4). The objective is to prevent LAN 1 from sending AppleTalk I
multicasts to LANs 2 and 3, yet allow AppleTalk I multicasts to be sent
from LAN 1 to LAN 4.
The filter described is a firewall filter; it acts as a barrier to protect the
network from a condition that may degrade network performance.
Figure 5-4 Using Firewall Filters to Reduce Multicasts
NOTE
The FN10 multicast storm protection feature may be thought of
as a firewall feature, in that it performs a protective blocking
function. However, it is not a filter. Multicast storm protection is
described in Section 3.10, Configuring Multicast Storm
Protection.
LAN 1
FN10
LAN 2
LAN 4 LAN 3
Concentrator Concentrator
Concentrator Concentrator